perkins



June 3, 1930.

N. W. PERKINS SUBTRACTION CONTROL FOR CALCULATING MACHINES 2Sheets-Sheet 1 Fil ed Jan. 28, 1926 June 3, 1930. N. w. PERKINS SUBTRACTION CONTROL F OR CALCULATING MACHINES Filed Jan. 28, 1926 2 Sheets-Sheet2.

irEn STATES PATENT OFFICE" I NATEAN PERKINS, OF EAST ORANGE, NEWJ'ERSEY,ASSIGNOR TO ELLIS ADDING COMPANY, OF NEWARK, NEW JERSEY, CORPORATION OFNEW 3133* sunrnncrroii ccn'rnor; roe cencuta'rrne mcnzmns Applicationfiled January as, 1926. Serial m. 84,471.

This invention relates to improved means for automatically setting'acalculating machine so that it will be adapted to perform the operationof subtraction when the mov- 5 able carriage is in a given position.

In the patent'to Bernau 1,550,945, August 25, 1925, there is set forthand clanned mechanism whereby the subtraction key of a calculatingmachine may be automatically in set when the movable carriage is in agiven position so that the machine is conditioned to be adapted toperform subtraction so long as the carriage remains in the position inwhich it is adapted to set said key. The Bernau mechanism also proposesthe use of means whereby the subtraction key maybe retained in setposition, when it has been depressed by reason of the carriage being ina given position, even though the carriage be moved to another position.

'lhe aforesaid Bernau patent sets forth at length the purpose of settingthe subtracting mechanism by the carriage and reference may behad'thereto fora full understanding of the classes of work which maymake it expedient to automatically condition the mar chine so that itwill be adapted to subtract so long as the carriage remains 1n a giventabulatedposition. It is unnecessary, there fore, to set forth at lengththe purpose of an invention of this general character audit sufices tostate that the purpose of the present invention is to automaticallycondition a calculating machine so that it will be a 3 adapted tosubtract so long as the travelling carriage remains inthat tabulatedposition where one or moresubtracting operations are desired to becarried on.- Like the Bernau mechanism of Patent 2 f 1,550,945,1nyinvention-relates to the well known Ellis calculating machine andreference may be had to Ellis Patent 1,203,863, November 7, 1916, andthe patent to Bernau 1,508,263", September 9, 1924, and the applicationof which said patent is a division, for a.

full disclosure of the Ellis type of adding and subtracting accumulatorand controlling means therefor, in connection withmy presentimprovements.

My present improvements are designed to the invention.

utilize the ordinary stops which are carried by the carriage of theEllis adding and subtracting machine to operate mechanism to set themachine for subtraction without having to move'the key latch, thelatterhaving asomewhat heavy spring.

My present invention diifers from the construction set forth in thepatent to Bernau 1,550,9i5, both as regards the mechanism which isoperated by the carriage to condition the machine so that itwill beadapted to perform subtraction and in that the mechanism does notdepress the subtraction key but acts directly on the subtracting setlink, instead of on the subtraction key. At the same time, the presentinvention does not interfere in any :manner with the manual setting ordepression of the subtraction key, and thus the operatormay at any timecondition the machine for subtraction regardless of the position of thecarriage, by depressing the subtraction key. I The present improvementsalso embrac the combination of a carriage operating mechanism with thesubtraction key mechanism as will appear hereinafter.

Unlike the mechanism of the Bernau Patent 1,550,945, my presentimprovements contemplate the immediate restoration of the mechanism tonormal position when the carriage is moved from that position orpositions where it cooperates with the mechanism, so that while theoperator may at any time manually depress the subtraction kcy,nevertheless, unless he does so, when the carriage moves from a positionwhere it automatically controls'my-mechanism, the ma-- In theaccompanying drawings: Figure 1 is a side elevation at the left of themachine showing the present improvebeing in section, the parts being innormal.

position; 1 I y F igure 3 1s a view similar to Figure 1, the total andsub-total keys and certain parts being omitted, and the presentmechanism shown in operated position {and Figure 4 is a front viewshowing the parts in the operated position.

The top of the shell or case of the calculating machine appears at B58.A section of the tabulating or stop rail which is carried by the movablecarriage of the machine appears at C91. The stop rail C91 is adapted tocarry one or more adjustable or settable stops S105. In the presentinstance only one such stop is shown, said stop having a cam shapedprojection a. The position of the stop S105 on the rail C91, determinesthe position the carriage will be required to assume in order to operatethe present mechanism. By adjusting the stop, subtracting operations maybe carried on according to any desired position of the carriage, andobviously, more than one subtracting. position may be thus predeterminedaccording to how many of the stops S105 are used and they are located onthe bar C91.

Pivoted at N61 to the frame of the machine is a lever NF61 which has a.cam point 5 projecting up through a slot in the shell in position to beengaged, and depressed, by the cam projection a. A shoulder 0 limitswhere the 'upward movement of the lever NF61.

The lever is normally held in the position shown in Figure 2 by a springF85 connected thereto and to the frame of the machine.

Suspended from the left hand end of the lever NFGl is a plate or pieceND68 which carries the stud NDlO.

Slidable vertically through, and guided by the piece ND68 is a linkNG-Ll-D which has a stud NDll connected to the stud NDlO by a coilspring F89. The link N641) is held in elevated position as shown inFigure 2, for instance, by the spring F89, the upward movementbeing-limited by the engagement of the stud 'NDll with the lower edgeol? the piece NDGS.

Pivoted at NLF) to the frame of the machine is a rocker NLSO. -Thisrocker is pivoted at NLS) to the link N611).

Pivoted to the frame of the machine at L260 is a lever NLQUO whose upperend is pivoted at NLlO to a link Nil-'31 which is, in turn, pivoted atNLll, to the rocker NLSO.

As thus far described, it will be seen that in a clockwise direction.

link N641) will rock the rocker-B31150 from the position shown in Figure1 to that shown in Figure 3, thereby swinging the lever-X11260 Thismovement is availed of to condition the machine so that it willsubtract, wl'ienoperatcd, and will con-.

tinue to function in that fashion so long as the lever NFtSl remains inits operated positlon illustrated in Figure 1. The movement is utilizedto shift a subtracting setlink (54L frointhc position shown in Figure 1.to the position appearing in Figure'ii. The set link has a cam slot Xwhose margin cooperates 'with the stud N17 on the frame of the machine.

The operation of this set link (HL and the parts with which itcooperates, and the operation of a subtracting cam lever (not shown) bythe pin L221; carried by lever NLQGO, to set and time the accumulator sothat it will subtract will be clear on reference to Figures 1 and 2 ofthe patent to Bernau 1,508,267, Scptei'nbei. 9, 1921.

The adding and subtracting accumulator with which my presentimprovements may be used is referred to'in the said Bernau patent andalso in the patent to llllis 1,203,8(33 of November 7, 1916. i

For the purpose of utilizing the lever NLQSO when the subtraction keyK67 is manually depressed, that is, to provide a. mechanism common tothe carriage and to the subtraction key, by which the accumulator may beset for subtraction either by carriage poition or manually, I providemeans now to be described.

Pivoted on the same center L200 on which the lever NLQGO'turns, is alatching arm Nlio i which is drawn in a clockwise directionby a springN81L. that is suitably cou nected to the frame of the machine. Thelatching arm Nli54lhas a lug (Z which bears against the edge of thelever NLQGO. The arm NLFA also has a projection NLMO which extendsoppositely to the projection or lug (Z and is disposed in position toenter a notch 70 in the subtraction key K67 when the latter is depressedby the operator. he projection NLFAO is therefore adapted to lock thesubtraction key in depressed position. as-the tension of the springNS'IL is such that it will cause this action on the setting of said key.hen the latching arm NLM is permitted to lock the key K67. the leverNLZGO is swung in a clockwise direction just as it is swung when thelever NFG'L is operated. The swinging of the lever NLQGO, as previouslyset Forth. shifts the subtracting set link (34th from the position shownin Figure 1 to that appearing in Figure I} and said sel link arrangesthe accun'mlator to carry on subtraction. Lever illJiO which is pivotedto the side frame of the machine at FLT, has

' meme? L14L "on the total and sub-total keys K63,

K64. The other end of the lever Nl m engages the pin L14 carried by thelever NLQGO.

position.

The purpose of this construction is to reset the lever M260 on thedepression oicither the total key or sub-total key, assun'iingthat .thesubtraction key K67 has been previously set.

"If the cam point or projection a should happen to be engaged withtheend b or the lever NFGl when either of keys, K63, K64, is

depressed, the; spring F89 will yield due to the pullexerted byjthe linkN641) and the lever NFol simpl mains in its depressed The JEllisll. hasseveral ilieys tively, control some operation,,of the-mm chine, suchasaddition, subtraction, and nonadd, an. while I have'illustrated and doscribed my invention in connectionwith but one of said keys, thesubtraction keyv K67, I do not intend to limit the use olthe partie -1lar mechanism comprising the invention as hereinafter'described, to usein CODIlllClllOH with the particular key (K67) specified. What it claimis:' p

l. In a calculating" machine, the combination with a travellingcarriage, of springoperated means normally subject to auto maticoperation by the carriage whenever the latter ism a predeterminedposition but be ing' otherwise unaficted by the carriage, said meanscontrollingthe performance of an operation of the machine, anda'manually open able key also adapted to. control the same operation asthat controlled by the carriage, control'by the carriage and by the keybeing withoutdependence on eachIother and without-interference. v

2. In a calculating machine having a travelling carriage, thecombination with means for directly controlling the performance of anoperation of the machine, said means being' arranged to be automaticallyactuated by the carriage when the carriage is in a given position orpositions but otherwise unafiected bythe-carriage, of a normallyinoperative manually operable key adapted for use at will to controlthesame. operation of the machine th ough the medium of the aforesaidmeans when the carriage is in other positions tem of articulated membersadapted, when operated, for setting the machine so that it known. as o'er'atin like s which-res ec-,

P g. a

will beconditioned to perform subtraction, said system of articulatedmembers being subject to automatic operation by the-carriage when thelatter is in one or more predetermined positions, but being otherwiseunaffected by the carriage, of a subtraction key which is unafiected by,and is independent of, the operation of said system of articulatedmembers by the carriage, said subtraction key being adapted for useatwill'to utilize said system of articulated members when the carriage isin other positions than those afore- I saidfor the purpose ofconditioning the ma chine forthe performance of subtraction, theaforesaid system of articulated members al-' ways beingconditioned foroperation either by the-carriage or by the subtraction key, the controlby the carriage and by the key being without efiecton each other.

l. In a calculating machine having a travelling carriage, thecombination with means normally conditioned to be adapted for opthecarriage has moved to another position,

said means controlling the performance of an operation of the machine,of a manually olp e erable key also adapted tor controlling tperformance of the same operation of the machine as controlled by theaforesaid means,

said key being unafiecte'd by the carriage and likewise unafiecting orthe operation of said means by the carriage and beingnormally free ofcontrol by said means so that thesaid means may automatically restoreitself to normal position when released. by the carriage, the aforesaidkeybeing adapted for 7 use at will to efiect the-performance of theaforesaid operation or the machine, the store said means for controllingthe performance of an operation or the machine always being conditionedfor operation either by the carriage or by the key,

' 5. In a calculatingmachine, the combination with a travellingcarriage,of means adapted, when operated, to set the machine for an operation'oifsubtraction, a manuallyoperable key adapted to operate said means,

said .key being unaffected by the action of the aforesaid means andunafiected by the carriage, and self-restoring other means normally setfor operation by the carriage when the latter is in a predeterminedposition and also adapted for operating the first-named meansindependently of the operation thereof by said key, the key likewiseunaii'ecting the operation of the first-named means by the carriage.

6. In a calculating machine having a travelling carriage and anaccumulator which is capable of use irrespective of the position of vthe said carriage, the combination with means for setting theaccumulator for the performance of a mathematical operation, oi anaimiliary means arranged to be automatically actuated by the carriageWhen the carriage is in a given position or positions, but otherwiseunatt'eeted by the carriage, said auxiliary means being adapted toactuate the means for setting: the accumulator, and a manually operablekey adapted for use at will to actuate the aforesaid means for settingthe accumulator regardless of the position of the car iiag'e, thecarriage and the key' being nondepemlent on each other, non-interferingand, respectively unaii'ecting each other when ere ercisine theircontrol over the means for setting the accumulator or at anyother time.

7. In a calculating machine having a travelling carriage-anti anaccumulator which is capable of use irrespective of the position oi":the saint c:i11'iage,'tl1e combination with means for setting theaccumulator for the performance ot a subtracting operation, o1" anauxiliary means arranged to be automatically actuated by the carriagewhen the carriage is in a given position or positions, but otherwiseunall'ert'ed by the carriage, said an: 'liarjJ means being adapted toactuate the means for settine the accun'iulator, and a manually operahlekey ailapted for use at will to actuate the aforesaid means for setting"the acmunulator to perform a subtracting operation regardless of theposition 01 the carriage, the carriage and the hey being; non-dependenton each other, iion-interfering and, respectively unaiiecting each otherwhen exercising their control orer the means for setting the ac--cuinulator or at any other time.

In te:';tinlo11 whereof A, atlix my signature.

NATHAN WV. PIERRE-l5}.

